:root{--navy:#0f2340;--blue:#1d3b66;--slate:#8a9bb4;--mist:#dfe5ee;--gold:#c9a227;--gold-dark:#8a6d10;--gold-light:#e8d18a;--teal:#2a7f7a;--teal-light:#a8d5cf;--cream:#f7f3e8;--paper:#fffdf8;--ink:#1b2533;--muted:#5a6778;--line:#e4e0d4;--danger:#b3261e;--success:#1f7a4d;--font-serif:"Iowan Old Style","Palatino Linotype",Palatino,"Book Antiqua",Georgia,serif;--font-sans:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;--radius:14px;--shadow:0 1px 2px rgba(15,35,64,0.06),0 8px 24px rgba(15,35,64,0.06);--bg:var(--cream);--surface:var(--paper);--surface-raised:#ffffff;--heading:var(--navy);--accent-text:var(--gold-dark);--chrome:var(--navy);--zebra:#faf7ef;--tint-blue:#f2f5fa;--tint-blue-line:#c9d4e4;--tint-teal:#eef8f6;--tint-green:#eef8f2;--tint-green-line:#cfe3d8;--tint-red:#fdf1f0;--tint-red-line:#efc1bd;--tint-gold:#fdf8e8;--good-text:#14532f;--bad-text:#7a1d17;--pill-gold-bg:#f4e7bb;--pill-gold-text:#6b540c;--pill-green-bg:#d6f0e2;--illustration-filter:none;color-scheme:light}:root[data-theme=dark]{--blue:#8fb3e6;--slate:#6f82a0;--mist:#243653;--teal:#4fb3aa;--teal-light:#2f6b67;--gold-light:#e8d18a;--ink:#e4e9f1;--muted:#a2afc2;--line:#26374f;--danger:#e8716a;--success:#3aa872;--shadow:0 1px 2px rgba(0,0,0,0.3),0 8px 24px rgba(0,0,0,0.25);--bg:#0a1424;--surface:#111f36;--surface-raised:#15263f;--heading:#f1ecdf;--accent-text:#dcbc55;--chrome:#1c3558;--zebra:#14243d;--tint-blue:rgba(143,179,230,0.09);--tint-blue-line:rgba(143,179,230,0.3);--tint-teal:rgba(79,179,170,0.1);--tint-green:rgba(58,168,114,0.12);--tint-green-line:rgba(58,168,114,0.35);--tint-red:rgba(232,113,106,0.12);--tint-red-line:rgba(232,113,106,0.4);--tint-gold:rgba(201,162,39,0.1);--good-text:#8fdcb2;--bad-text:#f3a9a3;--pill-gold-bg:rgba(201,162,39,0.2);--pill-gold-text:#ecd384;--pill-green-bg:rgba(58,168,114,0.2);--illustration-filter:brightness(0.84) saturate(0.95);color-scheme:dark}:root[data-theme=dark] .light-island{--blue:#1d3b66;--slate:#8a9bb4;--mist:#dfe5ee;--gold-light:#e8d18a;--ink:#1b2533;--muted:#5a6778;--line:#e4e0d4;--surface:#fffdf8;--heading:var(--navy);--accent-text:var(--gold-dark);color-scheme:light;color:var(--ink)}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font-sans);font-size:17px;line-height:1.65}img{max-width:100%;height:auto;display:block}img[src*="/illustrations/"]{filter:var(--illustration-filter)}a{color:var(--blue);text-underline-offset:3px}a:hover,h1,h2,h3,h4{color:var(--heading)}h1,h2,h3,h4{font-family:var(--font-serif);line-height:1.2;letter-spacing:-.01em}h1{font-size:clamp(2rem,4vw,2.8rem);margin:0 0 .5rem}h2{font-size:1.6rem;margin:2.2rem 0 .75rem}h3{font-size:1.25rem;margin:1.6rem 0 .5rem}.container{width:100%;max-width:1120px;margin:0 auto;padding:0 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a{color:#dbe3ef;text-decoration:none;font-weight:500}.site-nav a:hover{color:white}.site-nav a.button,.site-nav a.button:hover{color:var(--navy)}.site-nav form{margin:0}.theme-toggle{display:grid;place-items:center;width:36px;height:36px;padding:0;border-radius:50%;background:none;border:1px solid rgba(219,227,239,.3);color:#dbe3ef;cursor:pointer}.theme-toggle:hover{color:white;border-color:var(--gold-light)}.theme-toggle svg{width:18px;height:18px}.theme-toggle .icon-moon,:root[data-theme=light] .theme-toggle .icon-sun{display:none}:root[data-theme=light] .theme-toggle .icon-moon{display:block}.link-button{background:none;border:0;padding:0;font:inherit;color:#dbe3ef;cursor:pointer;font-weight:500}.link-button:hover{color:white}.site-footer{margin-top:80px;padding:32px 0 48px;border-top:1px solid var(--line);font-size:.9rem;color:var(--muted)}.site-footer p{max-width:760px}.footer-nav{display:flex;flex-wrap:wrap;gap:6px 20px;margin:18px 0 6px}.footer-nav a{color:var(--ink);text-decoration:none}.footer-nav a:hover{text-decoration:underline}.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--gold);color:var(--navy);border:0;border-radius:999px;padding:12px 22px;font:inherit;font-weight:700;text-decoration:none;cursor:pointer;transition:transform .12s ease,background .12s ease,box-shadow .12s ease;box-shadow:0 2px 0 var(--gold-dark)}.button:hover{background:#d6b23d;color:var(--navy);transform:translateY(-1px)}.button:active{transform:translateY(1px);box-shadow:none}.button:disabled{opacity:.6;cursor:default;transform:none}.button-small{padding:7px 16px;font-size:.92rem}.button-secondary{background:var(--surface-raised);color:var(--heading);box-shadow:inset 0 0 0 2px var(--mist)}.button-secondary:hover{background:var(--surface);box-shadow:inset 0 0 0 2px var(--slate)}.button-done{background:var(--success);color:white;box-shadow:0 2px 0 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img{border-radius:18px;box-shadow:var(--shadow)}.progress-panel{display:flex;gap:20px;align-items:center;padding:20px 24px;margin:24px 0}.progress-panel .grow{flex:1 1;min-width:0}.module-grid{display:grid;grid-gap:22px;gap:22px;margin-top:28px}.module-card{display:grid;grid-template-columns:260px 1fr;overflow:hidden}.module-card .cover{background:var(--mist)}.module-card .cover img{width:100%;height:100%;object-fit:cover}.module-card .body{padding:22px 26px}.module-card h3{margin:0 0 4px}.module-card .module-num{font-weight:700;color:var(--accent-text);font-size:.85rem;letter-spacing:.08em;text-transform:uppercase}@media (max-width:760px){.module-card{grid-template-columns:1fr}.module-card .cover img{aspect-ratio:16/9}}.lesson-list{list-style:none;padding:0;margin:14px 0 0}.lesson-list li{border-top:1px solid var(--line)}.lesson-list a{display:flex;align-items:center;gap:12px;padding:9px 2px;text-decoration:none;color:var(--ink)}.lesson-list a:hover{color:var(--blue)}.lesson-list 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4px;font-size:.82rem;text-transform:uppercase;letter-spacing:.1em;display:flex;align-items:center;gap:8px}.callout-title:before{content:"";width:10px;height:10px;transform:rotate(45deg);background:currentColor;border-radius:2px}.callout-important,.callout-note{border-color:var(--tint-blue-line);background:var(--tint-blue)}.callout-important .callout-title,.callout-note .callout-title{color:var(--blue)}.callout-tip{border-color:var(--teal-light);background:var(--tint-teal)}.callout-tip .callout-title{color:var(--teal)}.callout-caution,.callout-warning{border-color:var(--tint-red-line);background:var(--tint-red)}.callout-caution .callout-title,.callout-warning .callout-title{color:var(--danger)}.callout-example{border-color:var(--gold-light);background:var(--tint-gold)}.callout-example .callout-title{color:var(--accent-text)}.callout-checklist{border-color:var(--tint-green-line);background:var(--tint-green)}.callout-checklist .callout-title{color:var(--success)}.callout-checklist ul{list-style:none;padding-left:.2em}.block-error{background:var(--tint-red);color:var(--danger);padding:12px;border-radius:8px;white-space:pre-wrap}.lesson-footer{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;margin:40px 0 0;padding:22px 24px}.lesson-nav{display:grid;grid-template-columns:1fr 1fr;grid-gap:16px;gap:16px;margin-top:18px}.lesson-nav a{display:block;padding:14px 18px;text-decoration:none}.lesson-nav a small{display:block;color:var(--muted);font-size:.8rem;text-transform:uppercase;letter-spacing:.08em}.lesson-nav a.next{text-align:right;grid-column:2}@media (max-width:640px){.lesson-nav{grid-template-columns:1fr}.lesson-nav a.next{grid-column:1}}.ix{margin:1.8em 0;padding:20px 22px;border-radius:16px;background:var(--surface-raised);border:1px solid var(--line);box-shadow:var(--shadow);position:relative}.ix-label{position:absolute;top:-11px;left:18px;background:var(--chrome);color:var(--gold-light);font-size:.72rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase;padding:2px 10px;border-radius:999px}.ix-question{font-weight:700;color:var(--heading);margin:6px 0 12px;font-size:1.05rem}.options{display:grid;grid-gap:8px;gap:8px}.option{text-align:left;font:inherit;color:inherit;cursor:pointer;padding:10px 14px;border-radius:10px;border:2px solid var(--mist);background:var(--surface);display:flex;gap:10px;align-items:flex-start;transition:border-color .12s,background .12s}.option:hover:not(:disabled){border-color:var(--slate)}.option .letter{flex:none;width:24px;height:24px;border-radius:50%;background:var(--mist);display:grid;place-items:center;font-weight:800;font-size:.8rem;color:var(--blue)}.option.selected{border-color:var(--blue);background:var(--tint-blue)}.option.correct{border-color:var(--success);background:var(--tint-green)}.option.correct .letter{background:var(--success);color:white}.option.wrong{border-color:var(--danger);background:var(--tint-red)}.option.wrong .letter{background:var(--danger);color:white}.option:disabled{cursor:default}.feedback{margin-top:12px;padding:10px 14px;border-radius:10px;animation:pop .25s ease}.feedback.good{background:var(--tint-green);color:var(--good-text)}.feedback.bad{background:var(--tint-red);color:var(--bad-text)}@keyframes pop{0%{transform:scale(.97);opacity:0}to{transform:scale(1);opacity:1}}.reveal-answer{margin-top:12px;padding:12px 16px;border-left:4px solid var(--gold);background:var(--tint-gold);border-radius:0 10px 10px 0;animation:pop .25s ease}.reveal 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0;font-size:.92rem}.bar{height:14px;border-radius:999px;background:var(--mist);overflow:hidden}.bar>span{display:block;height:100%;background:var(--gold);transition:width .3s}.planner-table{width:100%;border-collapse:collapse;font-size:.92rem}.planner-table td,.planner-table th{padding:8px 6px;border-bottom:1px solid var(--line);text-align:left}.planner-table td.num,.planner-table th.num{text-align:right;font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.planner-table input[type=number]{width:100%;max-width:120px;font:inherit;color:inherit;padding:6px 8px;border-radius:8px;border:2px solid var(--mist);background:var(--surface)}.small-print{font-size:.82rem;color:var(--muted);margin:10px 0 0}.quiz-q{margin:0 0 22px}.quiz-q .explain{margin-top:10px;font-size:.95rem}.score-card{text-align:center;padding:28px;margin:20px 0}.score-card .big{font-size:3rem;font-weight:800;font-family:var(--font-serif);color:var(--heading)}.login-wrap{display:grid;grid-template-columns:1fr 1fr;grid-gap:40px;gap:40px;align-items:center;padding:48px 0}@media (max-width:860px){.login-wrap{grid-template-columns:1fr}.login-art{max-width:320px;margin:0 auto}}.login-card{padding:32px}.login-card input[type=password],.login-card input[type=text]{width:100%;font:inherit;font-size:1.1rem;color:inherit;padding:12px 14px;border-radius:12px;border:2px solid var(--mist);background:var(--surface-raised);margin:6px 0 14px}.login-card input:focus{border-color:var(--gold);outline:none}.form-error{color:var(--danger);font-weight:600}.notice{background:var(--tint-gold);border:1px solid var(--gold-light);border-radius:12px;padding:14px 16px;margin-bottom:14px}.dash-stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));grid-gap:16px;gap:16px;margin:24px 0}.dash-stats .card{padding:18px 20px}.dash-stats .value{font-size:2rem;font-weight:800;color:var(--heading);font-family:var(--font-serif)}.dash-stats .label{color:var(--muted);font-size:.9rem}.badges{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));grid-gap:12px;gap:12px}.badge-tile{padding:14px;justify-items:center;grid-gap:8px;gap:8px;font-size:.88rem}.badge-tile,.certificate{text-align:center;display:grid}.certificate{background:white;color:var(--ink);margin:30px auto;max-width:900px;aspect-ratio:1.414;padding:56px;border:14px solid var(--navy);outline:3px solid var(--gold);outline-offset:-26px;align-content:center;grid-gap:10px;gap:10px;position:relative;overflow:hidden}.certificate h1{font-size:2.6rem}.certificate .name{font-family:var(--font-serif);font-size:2.4rem;color:var(--accent-text);border-bottom:2px solid var(--gold-light);display:inline-block;padding:0 30px 6px;margin:10px auto}.certificate .certificate-note{font-size:.78rem;color:var(--muted);margin:0}.certificate .geo{position:absolute;opacity:.12;pointer-events:none}@media print{.no-print,.site-footer,.site-header{display:none!important}body{background:white}.certificate{margin:0;box-shadow:none}}.sr-only{width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}.burst,.sr-only{position:absolute}.burst{right:40px;top:-40px;width:120px;height:120px;pointer-events:none;overflow:visible}.burst>*{animation:burst .8s ease-out forwards}@keyframes burst{0%{transform:translate(0) scale(.4);opacity:1}to{transform:translate(var(--x),var(--y)) scale(1);opacity:0}}@media (prefers-reduced-motion:reduce){.burst{display:none}.flashcard-inner,.progress>span{transition:none}}@media (max-width:560px){body{font-size:16px}.container{padding:0 16px}.site-nav{gap:14px;font-size:.92rem}.site-nav .nav-courses{display:none}.brand{font-size:1rem}.ix{padding:18px 14px}.lesson-footer{padding:18px}}.legal{padding:36px 20px 0}.legal-art{border-radius:16px;margin-bottom:24px;aspect-ratio:2/1;object-fit:cover}.legal .lead{font-size:1.1rem}.legal .prose table td:first-child{white-space:nowrap;font-weight:600}.legal-nav{display:flex;flex-wrap:wrap;gap:8px 18px;margin-top:40px;padding-top:18px;border-top:1px solid var(--line);font-size:.92rem}.legal-nav [aria-current]{color:var(--muted);font-weight:600}@media (max-width:640px){.legal .prose table td:first-child{white-space:normal}.legal .prose table{display:block;overflow-x:auto}}.danger-zone{margin-top:12px;border:1px solid var(--tint-red-line);background:var(--tint-red);border-radius:12px;padding:12px 16px}.danger-zone summary{cursor:pointer;font-weight:600;color:var(--bad-text)}.danger-zone .confirm{display:flex;gap:8px;align-items:flex-start;margin:0 0 12px}.button-danger{background:var(--danger);color:white;box-shadow:none}